Sun reported calculation[1]} of T\(_c\)  around 475K at 250 GPa for Li\(_2\) MgH\(_{16}\) ,
which is best pictured as a lattice of MgH\(_{16}\)  clathrate-like units intercalated by Li.
The large unit is rather stable, while the Li donor adds electrons, lends the H sites
a more metallic character, and doubles the value of N(0). The maximum H frequency was
2400 cm\(^{-1}\) , in the same range as other HTS hydrides at similar pressure. As in other
hydrides, T\(_c\)  decreases with increasing pressure while \(\lambda \)  and the frequency spectrum
increases.
